It seems to be some kind of hoax.
Many tips tell us that Nokia X71 may be headed to other markets as Nokia 8.1 Plus, a name that has been making rounds since the time we saw first renders of Nokia X71. It seems that Nokia 8.1 Plus user guide was posted online inadvertently on the global site by HMD before taking it down later.
There is no trace of the user guide there now but if many have noticed it then Nokia 8.1 Plus will be coming soon.
Nokia X71 details:
Nokia X71 is a very interesting smartphone with few firsts like a punch-hole display and a 48 MP rear camera sensor with 120-degree wide-angle photography. It may seem that HMD is planning to take the fight for mid-range supremacy to competitors. Read detailed Nokia X71 specs and other information on its dedicated page.
You can read our complete Nokia X71 coverage by clicking here.
Thanks Vini, Amir & Xio-Feng for the tip. Cheers!!